Merged out from trunkQPID-2519

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/QPID-2519@1187375 13f79535-47bb-0310-9956-ffa450edef68

11 files changed, 244 insertions, 76 deletions

diff --git a/cpp/include/qpid/messaging/Address.h b/cpp/include/qpid/messaging/Address.h
index bebbfc72f6..63dce0c49d 100644
--- a/cpp/include/qpid/messaging/Address.h
+++ b/cpp/include/qpid/messaging/Address.h
@@ -119,7 +119,7 @@ class AddressImpl;
  * 
  * An address has value semantics.
  */
-class Address
+class QPID_MESSAGING_CLASS_EXTERN Address
 {
   public:
     QPID_MESSAGING_EXTERN Address();
diff --git a/cpp/include/qpid/messaging/Connection.h b/cpp/include/qpid/messaging/Connection.h
index 1ad7a7242f..165573e2ef 100644
--- a/cpp/include/qpid/messaging/Connection.h
+++ b/cpp/include/qpid/messaging/Connection.h
@@ -42,7 +42,7 @@ class Session;
  * A connection represents a network connection to a remote endpoint.
  */
 
-class Connection : public qpid::messaging::Handle<ConnectionImpl>
+class QPID_MESSAGING_CLASS_EXTERN Connection : public qpid::messaging::Handle<ConnectionImpl>
 {
   public:
     QPID_MESSAGING_EXTERN Connection(ConnectionImpl* impl);
@@ -54,27 +54,27 @@ class Connection : public qpid::messaging::Handle<ConnectionImpl>
      *     username
      *     password
      *     heartbeat
-     *     tcp-nodelay
-     *     sasl-mechanism
-     *     sasl-service
-     *     sasl-min-ssf
-     *     sasl-max-ssf
+     *     tcp_nodelay
+     *     sasl_mechanisms
+     *     sasl_service
+     *     sasl_min_ssf
+     *     sasl_max_ssf
      *     transport
      * 
      * Reconnect behaviour can be controlled through the following options:
      * 
      *     reconnect: true/false (enables/disables reconnect entirely)
-     *     reconnect-timeout: number of seconds (give up and report failure after specified time)
-     *     reconnect-limit: n (give up and report failure after specified number of attempts)
-     *     reconnect-interval-min: number of seconds (initial delay between failed reconnection attempts)
-     *     reconnect-interval-max: number of seconds (maximum delay between failed reconnection attempts)
-     *     reconnect-interval: shorthand for setting the same reconnect_interval_min/max
-     *     reconnect-urls: list of alternate urls to try when connecting
+     *     reconnect_timeout: number of seconds (give up and report failure after specified time)
+     *     reconnect_limit: n (give up and report failure after specified number of attempts)
+     *     reconnect_interval_min: number of seconds (initial delay between failed reconnection attempts)
+     *     reconnect_interval_max: number of seconds (maximum delay between failed reconnection attempts)
+     *     reconnect_interval: shorthand for setting the same reconnect_interval_min/max
+     *     reconnect_urls: list of alternate urls to try when connecting
      *
-     *     The reconnect-interval is the time that the client waits
+     *     The reconnect_interval is the time that the client waits
      *     for after a failed attempt to reconnect before retrying. It
-     *     starts at the value of the min-retry-interval and is
-     *     doubled every failure until the value of max-retry-interval
+     *     starts at the value of the min_retry_interval and is
+     *     doubled every failure until the value of max_retry_interval
      *     is reached.
      */
     QPID_MESSAGING_EXTERN Connection(const std::string& url, const qpid::types::Variant::Map& options = qpid::types::Variant::Map());
diff --git a/cpp/include/qpid/messaging/Duration.h b/cpp/include/qpid/messaging/Duration.h
index abcf169090..6b8f05c7c6 100644
--- a/cpp/include/qpid/messaging/Duration.h
+++ b/cpp/include/qpid/messaging/Duration.h
@@ -32,7 +32,7 @@ namespace messaging {
 /**   \ingroup messaging 
  * A duration is a time in milliseconds.
  */
-class Duration
+class QPID_MESSAGING_CLASS_EXTERN Duration
 {
   public:
     QPID_MESSAGING_EXTERN explicit Duration(uint64_t milliseconds);
@@ -46,9 +46,11 @@ class Duration
 };
 
 QPID_MESSAGING_EXTERN Duration operator*(const Duration& duration,
-                                      uint64_t multiplier);
+                                         uint64_t multiplier);
 QPID_MESSAGING_EXTERN Duration operator*(uint64_t multiplier,
-                                      const Duration& duration);
+                                         const Duration& duration);
+QPID_MESSAGING_EXTERN bool operator==(const Duration& a, const Duration& b);
+QPID_MESSAGING_EXTERN bool operator!=(const Duration& a, const Duration& b);
 
 }} // namespace qpid::messaging
 
diff --git a/cpp/include/qpid/messaging/FailoverUpdates.h b/cpp/include/qpid/messaging/FailoverUpdates.h
index 14a1a31b63..6d7314620a 100644
--- a/cpp/include/qpid/messaging/FailoverUpdates.h
+++ b/cpp/include/qpid/messaging/FailoverUpdates.h
@@ -32,7 +32,7 @@ struct FailoverUpdatesImpl;
  * A utility to listen for updates on cluster membership and update
  * the list of known urls for a connection accordingly.
  */
-class FailoverUpdates
+class QPID_MESSAGING_CLASS_EXTERN FailoverUpdates
 {
   public:
     QPID_MESSAGING_EXTERN FailoverUpdates(Connection& connection);
diff --git a/cpp/include/qpid/messaging/Handle.h b/cpp/include/qpid/messaging/Handle.h
index 1e634ef888..97a8f00b54 100644
--- a/cpp/include/qpid/messaging/Handle.h
+++ b/cpp/include/qpid/messaging/Handle.h
@@ -40,22 +40,22 @@ template <class T> class Handle {
   public:
 
     /**@return true if handle is valid,  i.e. not null. */
-    QPID_MESSAGING_EXTERN bool isValid() const { return impl; }
+    QPID_MESSAGING_INLINE_EXTERN bool isValid() const { return impl; }
 
     /**@return true if handle is null. It is an error to call any function on a null handle. */
-    QPID_MESSAGING_EXTERN bool isNull() const { return !impl; }
+    QPID_MESSAGING_INLINE_EXTERN bool isNull() const { return !impl; }
 
     /** Conversion to bool supports idiom if (handle) { handle->... } */
-    QPID_MESSAGING_EXTERN operator bool() const { return impl; }
+    QPID_MESSAGING_INLINE_EXTERN operator bool() const { return impl; }
 
     /** Operator ! supports idiom if (!handle) { do_if_handle_is_null(); } */
-    QPID_MESSAGING_EXTERN bool operator !() const { return !impl; }
+    QPID_MESSAGING_INLINE_EXTERN bool operator !() const { return !impl; }
 
     void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; }
 
   protected:
     typedef T Impl;
-    QPID_MESSAGING_EXTERN Handle() :impl() {}
+    QPID_MESSAGING_INLINE_EXTERN Handle() :impl() {}
 
     // Not implemented,subclasses must implement.
     QPID_MESSAGING_EXTERN Handle(const Handle&);
diff --git a/cpp/include/qpid/messaging/ImportExport.h b/cpp/include/qpid/messaging/ImportExport.h
index 52f3eb8568..ab5f21f618 100644
--- a/cpp/include/qpid/messaging/ImportExport.h
+++ b/cpp/include/qpid/messaging/ImportExport.h
@@ -20,14 +20,16 @@
  * under the License.
  */
 
-#if defined(WIN32) && !defined(QPID_DECLARE_STATIC)
+#include "qpid/ImportExport.h"
+
 #if defined(CLIENT_EXPORT) || defined (qpidmessaging_EXPORTS)
-#define QPID_MESSAGING_EXTERN __declspec(dllexport)
-#else
-#define QPID_MESSAGING_EXTERN __declspec(dllimport)
-#endif
+#  define QPID_MESSAGING_EXTERN QPID_EXPORT
+#  define QPID_MESSAGING_CLASS_EXTERN QPID_CLASS_EXPORT
+#  define QPID_MESSAGING_INLINE_EXTERN QPID_INLINE_EXPORT
 #else
-#define QPID_MESSAGING_EXTERN
+#  define QPID_MESSAGING_EXTERN QPID_IMPORT
+#  define QPID_MESSAGING_CLASS_EXTERN QPID_CLASS_IMPORT
+#  define QPID_MESSAGING_INLINE_EXTERN QPID_INLINE_IMPORT
 #endif
 
 #endif  /*!QPID_MESSAGING_IMPORTEXPORT_H*/
diff --git a/cpp/include/qpid/messaging/Message.h b/cpp/include/qpid/messaging/Message.h
index d48af35cc0..e89a6ce02f 100644
--- a/cpp/include/qpid/messaging/Message.h
+++ b/cpp/include/qpid/messaging/Message.h
@@ -39,7 +39,7 @@ struct MessageImpl;
 /**   \ingroup messaging 
  * Representation of a message.
  */
-class Message
+class QPID_MESSAGING_CLASS_EXTERN Message
 {
   public:
     QPID_MESSAGING_EXTERN Message(const std::string& bytes = std::string());
@@ -55,23 +55,58 @@ class Message
     QPID_MESSAGING_EXTERN void setSubject(const std::string&);
     QPID_MESSAGING_EXTERN const std::string& getSubject() const;
 
+    /**
+     * Set the content type (i.e. the MIME type) for the message. This
+     * should be set by the sending application and indicates to
+     * recipients of message how to interpret or decode the content.
+     */
     QPID_MESSAGING_EXTERN void setContentType(const std::string&);
+    /**
+     * Returns the content type (i.e. the MIME type) for the
+     * message. This can be used to determine how to decode the
+     * message content.
+     */
     QPID_MESSAGING_EXTERN const std::string& getContentType() const;
 
+    /**
+     * Set an application defined identifier for the message. At
+     * present this must be a stringfied UUID (support for less
+     * restrictive IDs is anticipated however).
+     */
     QPID_MESSAGING_EXTERN void setMessageId(const std::string&);
     QPID_MESSAGING_EXTERN const std::string& getMessageId() const;
 
+    /**
+     * Sets the user id of the message. This should in general be the
+     * user-id as which the sending connection authenticated itself as
+     * the messaging infrastructure will verify this. See
+     * Connection::getAuthenticatedUsername()
+     */
     QPID_MESSAGING_EXTERN void setUserId(const std::string&);
     QPID_MESSAGING_EXTERN const std::string& getUserId() const;
 
+    /**
+     * Can be used to set application specific correlation identifiers
+     * as part of a protocol for message exchange patterns. E.g. a
+     * request-reponse pattern might require the correlation-id of the
+     * request and response to match, or might use the message-id of
+     * the request as the correlation-id on the response etc.
+     */
     QPID_MESSAGING_EXTERN void setCorrelationId(const std::string&);
     QPID_MESSAGING_EXTERN const std::string& getCorrelationId() const;
 
+    /**
+     * Sets a priority level on the message. This may be used by the
+     * messaging infrastructure to prioritise delivery of higher
+     * priority messages.
+     */
     QPID_MESSAGING_EXTERN void setPriority(uint8_t);
     QPID_MESSAGING_EXTERN uint8_t getPriority() const;
 
     /**
-     * Set the time to live for this message in milliseconds.
+     * Set the time to live for this message in milliseconds. This can
+     * be used by the messaging infrastructure to discard messages
+     * that are no longer of relevance.
      */
     QPID_MESSAGING_EXTERN void setTtl(Duration ttl);
     /**
@@ -79,24 +114,62 @@ class Message
      */
     QPID_MESSAGING_EXTERN Duration getTtl() const;
 
+    /**
+     * Mark the message as durable. This is a hint to the messaging
+     * infrastructure that the message should be persisted or
+     * otherwise stored such that failoures or shutdown do not cause
+     * it to be lost.
+     */
     QPID_MESSAGING_EXTERN void setDurable(bool durable);
     QPID_MESSAGING_EXTERN bool getDurable() const;
 
+    /**
+     * The redelivered flag if set implies that the message *may* have
+     * been previously delivered and thus is a hint to the application
+     * or messaging infrastructure that if de-duplication is required
+     * this message should be examined to determine if it is a
+     * duplicate.
+     */
     QPID_MESSAGING_EXTERN bool getRedelivered() const;
+    /**
+     * Can be used to provide a hint to the application or messaging
+     * infrastructure that if de-duplication is required this message
+     * should be examined to determine if it is a duplicate.
+     */
     QPID_MESSAGING_EXTERN void setRedelivered(bool);
 
+    /**
+     * In addition to a payload (i.e. the content), messages can
+     * include annotations describing aspectf of the message. In
+     * addition to the standard annotations such as TTL and content
+     * type, application- or context- specific properties can also be
+     * defined. Each message has a map of name values for such custom
+     * properties. The value is specified as a Variant.
+     */
     QPID_MESSAGING_EXTERN const qpid::types::Variant::Map& getProperties() const;
     QPID_MESSAGING_EXTERN qpid::types::Variant::Map& getProperties();
 
+    /**
+     * Set the content to the data held in the string parameter. Note:
+     * this is treated as raw bytes and need not be text. Consider
+     * setting the content-type to indicate how the data should be
+     * interpreted by recipients.
+     */
     QPID_MESSAGING_EXTERN void setContent(const std::string&);
     /**
-     * Note that chars are copied.
+     * Copy count bytes from the region pointed to by chars as the
+     * message content.
      */
     QPID_MESSAGING_EXTERN void setContent(const char* chars, size_t count);
 
     /** Get the content as a std::string */
     QPID_MESSAGING_EXTERN std::string getContent() const;
-    /** Get a const pointer to the start of the content data. */
+    /**
+     * Get a const pointer to the start of the content data. The
+     * memory pointed to is owned by the message. The getContentSize()
+     * method indicates how much data there is (i.e. the extent of the
+     * memory region pointed to by the return value of this method).
+     */
     QPID_MESSAGING_EXTERN const char* getContentPtr() const;
     /** Get the size of content in bytes. */
     QPID_MESSAGING_EXTERN size_t getContentSize() const;
@@ -107,9 +180,9 @@ class Message
     friend struct MessageImplAccess;
 };
 
-struct EncodingException : qpid::types::Exception
+struct QPID_MESSAGING_CLASS_EXTERN EncodingException : qpid::types::Exception
 {
-    EncodingException(const std::string& msg);
+    QPID_MESSAGING_EXTERN EncodingException(const std::string& msg);
 };
 
 /**
@@ -122,8 +195,8 @@ struct EncodingException : qpid::types::Exception
  * @exception EncodingException
  */
 QPID_MESSAGING_EXTERN void decode(const Message& message,
-                               qpid::types::Variant::Map& map,
-                               const std::string& encoding = std::string());
+                                  qpid::types::Variant::Map& map,
+                                  const std::string& encoding = std::string());
 /**
  * Decodes message content into a Variant::List.
  * 
@@ -134,8 +207,8 @@ QPID_MESSAGING_EXTERN void decode(const Message& message,
  * @exception EncodingException
  */
 QPID_MESSAGING_EXTERN void decode(const Message& message,
-                               qpid::types::Variant::List& list,
-                               const std::string& encoding = std::string());
+                                  qpid::types::Variant::List& list,
+                                  const std::string& encoding = std::string());
 /**
  * Encodes a Variant::Map into a message.
  * 
@@ -146,8 +219,8 @@ QPID_MESSAGING_EXTERN void decode(const Message& message,
  * @exception EncodingException
  */
 QPID_MESSAGING_EXTERN void encode(const qpid::types::Variant::Map& map,
-                               Message& message,
-                               const std::string& encoding = std::string());
+                                  Message& message,
+                                  const std::string& encoding = std::string());
 /**
  * Encodes a Variant::List into a message.
  * 
@@ -158,8 +231,8 @@ QPID_MESSAGING_EXTERN void encode(const qpid::types::Variant::Map& map,
  * @exception EncodingException
  */
 QPID_MESSAGING_EXTERN void encode(const qpid::types::Variant::List& list,
-                               Message& message,
-                               const std::string& encoding = std::string());
+                                  Message& message,
+                                  const std::string& encoding = std::string());
 
 }} // namespace qpid::messaging
 
diff --git a/cpp/include/qpid/messaging/Receiver.h b/cpp/include/qpid/messaging/Receiver.h
index 6f3ae961db..13317dfcbd 100644
--- a/cpp/include/qpid/messaging/Receiver.h
+++ b/cpp/include/qpid/messaging/Receiver.h
@@ -41,7 +41,7 @@ class Session;
 /**   \ingroup messaging 
  * Interface through which messages are received.
  */
-class Receiver : public qpid::messaging::Handle<ReceiverImpl>
+class QPID_MESSAGING_CLASS_EXTERN Receiver : public qpid::messaging::Handle<ReceiverImpl>
 {
   public:
     QPID_MESSAGING_EXTERN Receiver(ReceiverImpl* impl = 0);
diff --git a/cpp/include/qpid/messaging/Sender.h b/cpp/include/qpid/messaging/Sender.h
index 85658f37cc..8e1c5846e9 100644
--- a/cpp/include/qpid/messaging/Sender.h
+++ b/cpp/include/qpid/messaging/Sender.h
@@ -40,7 +40,7 @@ class Session;
 /**   \ingroup messaging 
  * Interface through which messages are sent.
  */
-class Sender : public qpid::messaging::Handle<SenderImpl>
+class QPID_MESSAGING_CLASS_EXTERN Sender : public qpid::messaging::Handle<SenderImpl>
 {
   public:
     QPID_MESSAGING_EXTERN Sender(SenderImpl* impl = 0);
diff --git a/cpp/include/qpid/messaging/Session.h b/cpp/include/qpid/messaging/Session.h
index 6c023629e0..e8d6efb35d 100644
--- a/cpp/include/qpid/messaging/Session.h
+++ b/cpp/include/qpid/messaging/Session.h
@@ -46,7 +46,7 @@ class SessionImpl;
  * A session represents a distinct 'conversation' which can involve
  * sending and receiving messages to and from different addresses.
  */
-class Session : public qpid::messaging::Handle<SessionImpl>
+class QPID_MESSAGING_CLASS_EXTERN Session : public qpid::messaging::Handle<SessionImpl>
 {
   public:
     QPID_MESSAGING_EXTERN Session(SessionImpl* impl = 0);
@@ -62,6 +62,12 @@ class Session : public qpid::messaging::Handle<SessionImpl>
      */
     QPID_MESSAGING_EXTERN void close();
 
+    /**
+     * Commits the sessions transaction.
+     *
+     * @exception TransactionAborted if the original session is lost
+     * forcing an automatic rollback.
+     */
     QPID_MESSAGING_EXTERN void commit();
     QPID_MESSAGING_EXTERN void rollback();
 
@@ -78,6 +84,10 @@ class Session : public qpid::messaging::Handle<SessionImpl>
      */
     QPID_MESSAGING_EXTERN void acknowledge(Message&, bool sync=false);
     /**
+     * Acknowledges all message up to the specified message.
+     */
+    QPID_MESSAGING_EXTERN void acknowledgeUpTo(Message&, bool sync=false);
+    /**
      * Rejects the specified message. The broker does not redeliver a
      * message that has been rejected. Once a message has been
      * acknowledged, it can no longer be rejected.
@@ -135,25 +145,51 @@ class Session : public qpid::messaging::Handle<SessionImpl>
     /**
      * Create a new sender through which messages can be sent to the
      * specified address.
+     *
+     * @exception ResolutionError if there is an error in resolving
+     * the address
      */
     QPID_MESSAGING_EXTERN Sender createSender(const Address& address);
+    /**
+     * Create a new sender through which messages can be sent to the
+     * specified address.
+     *
+     * @exception ResolutionError if there is an error in resolving
+     * the address
+     *
+     * @exception MalformedAddress if the syntax of address is not
+     * valid
+     */
     QPID_MESSAGING_EXTERN Sender createSender(const std::string& address);
 
     /**
      * Create a new receiver through which messages can be received
      * from the specified address.
+     *
+     * @exception ResolutionError if there is an error in resolving
+     * the address
      */
     QPID_MESSAGING_EXTERN Receiver createReceiver(const Address& address);
+    /**
+     * Create a new receiver through which messages can be received
+     * from the specified address.
+     *
+     * @exception ResolutionError if there is an error in resolving
+     * the address
+     *
+     * @exception MalformedAddress if the syntax of address is not
+     * valid
+     */
     QPID_MESSAGING_EXTERN Receiver createReceiver(const std::string& address);
 
     /**
      * Returns the sender with the specified name.
-     *@exception KeyError if there is none for that name.
+     * @exception KeyError if there is none for that name.
      */
     QPID_MESSAGING_EXTERN Sender getSender(const std::string& name) const;
     /**
      * Returns the receiver with the specified name.
-     *@exception KeyError if there is none for that name.
+     * @exception KeyError if there is none for that name.
      */
     QPID_MESSAGING_EXTERN Receiver getReceiver(const std::string& name) const;
     /**
@@ -162,7 +198,16 @@ class Session : public qpid::messaging::Handle<SessionImpl>
      */
     QPID_MESSAGING_EXTERN Connection getConnection() const;
 
+    /**
+     * @returns true if the session has been rendered invalid by some
+     * exception, false if it is valid for use.
+     */
     QPID_MESSAGING_EXTERN bool hasError();
+    /**
+     * If the session has been rendered invalid by some exception,
+     * this method will result in that exception being thrown on
+     * calling this method.
+     */
     QPID_MESSAGING_EXTERN void checkError();
 
 #ifndef SWIG
diff --git a/cpp/include/qpid/messaging/exceptions.h b/cpp/include/qpid/messaging/exceptions.h
index 0ff608b343..31e2488d91 100644
--- a/cpp/include/qpid/messaging/exceptions.h
+++ b/cpp/include/qpid/messaging/exceptions.h
@@ -10,9 +10,9 @@
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
- * 
+ *
  *   http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
@@ -29,34 +29,47 @@
 namespace qpid {
 namespace messaging {
 
-/** \ingroup messaging 
+/** \ingroup messaging
  */
 
-struct MessagingException : public qpid::types::Exception 
+/**
+ * This is the base class for all messaging related exceptions thrown
+ * by this API.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN MessagingException : public qpid::types::Exception
 {
     QPID_MESSAGING_EXTERN MessagingException(const std::string& msg);
     QPID_MESSAGING_EXTERN virtual ~MessagingException() throw();
-    
+
     qpid::types::Variant::Map detail;
     //TODO: override what() to include detail if present
 };
 
-struct InvalidOptionString : public MessagingException 
+/**
+ * Thrown when the syntax of the option string used to configure a
+ * connection in not valid
+ */
+struct QPID_MESSAGING_CLASS_EXTERN InvalidOptionString : public MessagingException
 {
     QPID_MESSAGING_EXTERN InvalidOptionString(const std::string& msg);
 };
 
-struct KeyError : public MessagingException
+/**
+ * Thrown to indicate a failed lookup of some local object. For
+ * example when attempting to retrieve a session, sender or receiver
+ * by name.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN KeyError : public MessagingException
 {
     QPID_MESSAGING_EXTERN KeyError(const std::string&);
 };
 
-struct LinkError : public MessagingException
+struct QPID_MESSAGING_CLASS_EXTERN LinkError : public MessagingException
 {
     QPID_MESSAGING_EXTERN LinkError(const std::string&);
 };
 
-struct AddressError : public LinkError
+struct QPID_MESSAGING_CLASS_EXTERN AddressError : public LinkError
 {
     QPID_MESSAGING_EXTERN AddressError(const std::string&);
 };
@@ -65,85 +78,118 @@ struct AddressError : public LinkError
  * Thrown when a syntactically correct address cannot be resolved or
  * used.
  */
-struct ResolutionError : public AddressError 
+struct QPID_MESSAGING_CLASS_EXTERN ResolutionError : public AddressError
 {
     QPID_MESSAGING_EXTERN ResolutionError(const std::string& msg);
 };
 
-struct AssertionFailed : public ResolutionError 
+/**
+ * Thrown when creating a sender or receiver for an address for which
+ * some asserted property of the node is not matched.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN AssertionFailed : public ResolutionError
 {
     QPID_MESSAGING_EXTERN AssertionFailed(const std::string& msg);
 };
 
-struct NotFound : public ResolutionError 
+/**
+ * Thrown on attempts to create a sender or receiver to a non-existent
+ * node.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN NotFound : public ResolutionError
 {
     QPID_MESSAGING_EXTERN NotFound(const std::string& msg);
 };
 
 /**
- * Thrown when an address string with inalid sytanx is used.
+ * Thrown when an address string with invalid syntax is used.
  */
-struct MalformedAddress : public AddressError 
+struct QPID_MESSAGING_CLASS_EXTERN MalformedAddress : public AddressError
 {
     QPID_MESSAGING_EXTERN MalformedAddress(const std::string& msg);
 };
 
-struct ReceiverError : public LinkError
+struct QPID_MESSAGING_CLASS_EXTERN ReceiverError : public LinkError
 {
     QPID_MESSAGING_EXTERN ReceiverError(const std::string&);
 };
 
-struct FetchError : public ReceiverError
+struct QPID_MESSAGING_CLASS_EXTERN FetchError : public ReceiverError
 {
     QPID_MESSAGING_EXTERN FetchError(const std::string&);
 };
 
-struct NoMessageAvailable : public FetchError
+/**
+ * Thrown by Receiver::fetch(), Receiver::get() and
+ * Session::nextReceiver() to indicate that there no message was
+ * available before the timeout specified.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN NoMessageAvailable : public FetchError
 {
     QPID_MESSAGING_EXTERN NoMessageAvailable();
 };
 
-struct SenderError : public LinkError
+struct QPID_MESSAGING_CLASS_EXTERN SenderError : public LinkError
 {
     QPID_MESSAGING_EXTERN SenderError(const std::string&);
 };
 
-struct SendError : public SenderError
+struct QPID_MESSAGING_CLASS_EXTERN SendError : public SenderError
 {
     QPID_MESSAGING_EXTERN SendError(const std::string&);
 };
 
-struct TargetCapacityExceeded : public SendError
+/**
+ * Thrown to indicate that the sender attempted to send a message that
+ * would result in the target node on the peer exceeding a
+ * preconfigured capacity.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN TargetCapacityExceeded : public SendError
 {
     QPID_MESSAGING_EXTERN TargetCapacityExceeded(const std::string&);
 };
 
-struct SessionError : public MessagingException
+struct QPID_MESSAGING_CLASS_EXTERN SessionError : public MessagingException
 {
     QPID_MESSAGING_EXTERN SessionError(const std::string&);
 };
 
-struct TransactionError : public SessionError
+struct QPID_MESSAGING_CLASS_EXTERN TransactionError : public SessionError
 {
     QPID_MESSAGING_EXTERN TransactionError(const std::string&);
 };
 
-struct TransactionAborted : public TransactionError
+/**
+ * Thrown on Session::commit() if reconnection results in the
+ * transaction being automatically aborted.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN TransactionAborted : public TransactionError
 {
     QPID_MESSAGING_EXTERN TransactionAborted(const std::string&);
 };
 
-struct UnauthorizedAccess : public SessionError
+/**
+ * Thrown to indicate that the application attempted to do something
+ * for which it was not authorised by its peer.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN UnauthorizedAccess : public SessionError
 {
     QPID_MESSAGING_EXTERN UnauthorizedAccess(const std::string&);
 };
 
-struct ConnectionError : public MessagingException
+struct QPID_MESSAGING_CLASS_EXTERN ConnectionError : public MessagingException
 {
     QPID_MESSAGING_EXTERN ConnectionError(const std::string&);
 };
 
-struct TransportFailure : public MessagingException
+/**
+ * Thrown to indicate loss of underlying connection. When
+ * auto-reconnect is used this will be caught by the library and used
+ * to trigger reconnection attempts. If reconnection fails (according
+ * to whatever settings have been configured), then an instnace of
+ * this class will be thrown to signal that.
+ */
+struct QPID_MESSAGING_CLASS_EXTERN TransportFailure : public MessagingException
 {
     QPID_MESSAGING_EXTERN TransportFailure(const std::string&);
 };